Complete the series: 4, 20, 35, 49, 62, 74, ______?
- 84
- 85
- 93
- 94
Explanation
Step 1: Find the differences between consecutive terms
20 − 4 = 16
35 − 20 = 15
49 − 35 = 14
62 − 49 = 13
74 − 62 = 12
The differences decrease by 1 each time: 16, 15, 14, 13, 12, …
Step 2: Find the next difference
Next difference = 11
Step 3: Find the next term
Next term = 74 + 11 = 85
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